function! go#cmd#autowrite() abort
  if &autowrite == 1 || &autowriteall == 1
    silent! wall
  else
    for l:nr in range(0, bufnr('$'))
      if buflisted(l:nr) && getbufvar(l:nr, '&modified')
        " Sleep one second to make sure people see the message. Otherwise it is
        " often immediacy overwritten by the async messages (which also don't
        " invoke the "hit ENTER" prompt).
        call go#util#EchoWarning('[No write since last change]')
        sleep 1
        return
      endif
    endfor
  endif
endfunction

" Build builds the source code without producing any output binary. We live in
" an editor so the best is to build it to catch errors and fix them. By
" default it tries to call simply 'go build', but it first tries to get all
" dependent files for the current folder and passes it to go build.
function! go#cmd#Build(bang, ...) abort
  " Create our command arguments. go build discards any results when it
  " compiles multiple packages. So we pass the `errors` package just as an
  " placeholder with the current folder (indicated with '.'). We also pass -i
  " that tries to install the dependencies, this has the side effect that it
  " caches the build results, so every other build is faster.
  let l:args =
        \ ['build', '-tags', go#config#BuildTags()] +
        \ map(copy(a:000), "expand(v:val)") +
        \ [".", "errors"]

  " Vim and Neovim async.
  if go#util#has_job()
    call s:cmd_job({
          \ 'cmd': ['go'] + args,
          \ 'bang': a:bang,
          \ 'for': 'GoBuild',
          \ 'statustype': 'build'
          \})

  " Vim 7.4 without async
  else
    let default_makeprg = &makeprg
    let &makeprg = "go " . join(go#util#Shelllist(args), ' ')

    let l:listtype = go#list#Type("GoBuild")
    " execute make inside the source folder so we can parse the errors
    " correctly
    let cd = exists('*haslocaldir') && haslocaldir() ? 'lcd ' : 'cd '
    let dir = getcwd()
    try
      execute cd . fnameescape(expand("%:p:h"))
      if l:listtype == "locationlist"
        silent! exe 'lmake!'
      else
        silent! exe 'make!'
      endif
      redraw!
    finally
      execute cd . fnameescape(dir)
    endtry

    let errors = go#list#Get(l:listtype)
    call go#list#Window(l:listtype, len(errors))
    if !empty(errors) && !a:bang
      call go#list#JumpToFirst(l:listtype)
    else
      call go#util#EchoSuccess("[build] SUCCESS")
    endif

    let &makeprg = default_makeprg
  endif
endfunction


" BuildTags sets or shows the current build tags used for tools
function! go#cmd#BuildTags(bang, ...) abort
  if a:0
    let v = a:1
    if v == '""' || v == "''"
      let v = ""
    endif
    call go#config#SetBuildTags(v)
    let tags = go#config#BuildTags()
    if empty(tags)
      call go#util#EchoSuccess("build tags are cleared")
    else
      call go#util#EchoSuccess("build tags are changed to: " . tags)
    endif

    return
  endif

  let tags = go#config#BuildTags()
  if empty(tags)
    call go#util#EchoSuccess("build tags are not set")
  else
    call go#util#EchoSuccess("current build tags: " . tags)
  endif
endfunction


" Run runs the current file (and their dependencies if any) in a new terminal.
function! go#cmd#RunTerm(bang, mode, files) abort
  let cmd = "go run "
  let tags = go#config#BuildTags()
  if len(tags) > 0
    let cmd .= "-tags " . go#util#Shellescape(tags) . " "
  endif

  if empty(a:files)
    let cmd .= go#util#Shelljoin(go#tool#Files())
  else
    let cmd .= go#util#Shelljoin(map(copy(a:files), "expand(v:val)"), 1)
  endif
  call go#term#newmode(a:bang, cmd, a:mode)
endfunction

" Run runs the current file (and their dependencies if any) and outputs it.
" This is intended to test small programs and play with them. It's not
" suitable for long running apps, because vim is blocking by default and
" calling long running apps will block the whole UI.
function! go#cmd#Run(bang, ...) abort
  if has('nvim')
    call go#cmd#RunTerm(a:bang, '', a:000)
    return
  endif

  if go#util#has_job()
    " NOTE(arslan): 'term': 'open' case is not implement for +jobs. This means
    " executions waiting for stdin will not work. That's why we don't do
    " anything. Once this is implemented we're going to make :GoRun async
  endif

  let cmd = "go run "
  let tags = go#config#BuildTags()
  if len(tags) > 0
    let cmd .= "-tags " . go#util#Shellescape(tags) . " "
  endif

  if go#util#IsWin()
    if a:0 == 0
      exec '!' . cmd . go#util#Shelljoin(go#tool#Files(), 1)
    else
      exec '!' . cmd . go#util#Shelljoin(map(copy(a:000), "expand(v:val)"), 1)
    endif

    if v:shell_error
      redraws! | echon "vim-go: [run] " | echohl ErrorMsg | echon "FAILED"| echohl None
    else
      redraws! | echon "vim-go: [run] " | echohl Function | echon "SUCCESS"| echohl None
    endif

    return
  endif

  " :make expands '%' and '#' wildcards, so they must also be escaped
  let default_makeprg = &makeprg
  if a:0 == 0
    let &makeprg = cmd . go#util#Shelljoin(go#tool#Files(), 1)
  else
    let &makeprg = cmd . go#util#Shelljoin(map(copy(a:000), "expand(v:val)"), 1)
  endif

  let l:listtype = go#list#Type("GoRun")

  if l:listtype == "locationlist"
    exe 'lmake!'
  else
    exe 'make!'
  endif

  let items = go#list#Get(l:listtype)
  let errors = go#tool#FilterValids(items)

  call go#list#Populate(l:listtype, errors, &makeprg)
  call go#list#Window(l:listtype, len(errors))
  if !empty(errors) && !a:bang
    call go#list#JumpToFirst(l:listtype)
  endif

  let &makeprg = default_makeprg
endfunction

" Install installs the package by simple calling 'go install'. If any argument
" is given(which are passed directly to 'go install') it tries to install
" those packages. Errors are populated in the location window.
function! go#cmd#Install(bang, ...) abort
  " use vim's job functionality to call it asynchronously
  if go#util#has_job()
    " expand all wildcards(i.e: '%' to the current file name)
    let goargs = map(copy(a:000), "expand(v:val)")

    call s:cmd_job({
          \ 'cmd': ['go', 'install', '-tags', go#config#BuildTags()] + goargs,
          \ 'bang': a:bang,
          \ 'for': 'GoInstall',
          \ 'statustype': 'install'
          \})
    return
  endif

  let default_makeprg = &makeprg

  " :make expands '%' and '#' wildcards, so they must also be escaped
  let goargs = go#util#Shelljoin(map(copy(a:000), "expand(v:val)"), 1)
  let &makeprg = "go install " . goargs

  let l:listtype = go#list#Type("GoInstall")
  " execute make inside the source folder so we can parse the errors
  " correctly
  let cd = exists('*haslocaldir') && haslocaldir() ? 'lcd ' : 'cd '
  let dir = getcwd()
  try
    execute cd . fnameescape(expand("%:p:h"))
    if l:listtype == "locationlist"
      silent! exe 'lmake!'
    else
      silent! exe 'make!'
    endif
    redraw!
  finally
    execute cd . fnameescape(dir)
  endtry

  let errors = go#list#Get(l:listtype)
  call go#list#Window(l:listtype, len(errors))
  if !empty(errors) && !a:bang
    call go#list#JumpToFirst(l:listtype)
  else
    call go#util#EchoSuccess("installed to ". go#path#Default())
  endif

  let &makeprg = default_makeprg
endfunction

" Generate runs 'go generate' in similar fashion to go#cmd#Build()
function! go#cmd#Generate(bang, ...) abort
  let default_makeprg = &makeprg

  " :make expands '%' and '#' wildcards, so they must also be escaped
  let goargs = go#util#Shelljoin(map(copy(a:000), "expand(v:val)"), 1)
  if go#util#ShellError() != 0
    let &makeprg = "go generate " . goargs
  else
    let gofiles = go#util#Shelljoin(go#tool#Files(), 1)
    let &makeprg = "go generate " . goargs . ' ' . gofiles
  endif

  let l:listtype = go#list#Type("GoGenerate")

  echon "vim-go: " | echohl Identifier | echon "generating ..."| echohl None
  if l:listtype == "locationlist"
    silent! exe 'lmake!'
  else
    silent! exe 'make!'
  endif
  redraw!

  let errors = go#list#Get(l:listtype)
  call go#list#Window(l:listtype, len(errors))
  if !empty(errors)
    if !a:bang
      call go#list#JumpToFirst(l:listtype)
    endif
  else
    redraws! | echon "vim-go: " | echohl Function | echon "[generate] SUCCESS"| echohl None
  endif

  let &makeprg = default_makeprg
endfunction

" ---------------------
" | Vim job callbacks |
" ---------------------

function! s:cmd_job(args) abort
  " autowrite is not enabled for jobs
  call go#cmd#autowrite()

  call go#job#Spawn(a:args.cmd, a:args)
endfunction

" vim: sw=2 ts=2 et
